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从土地不连续利用和低人口密度这两个城市蔓延的核心特征出发,提出了城市土地扩张指标与人口密度指标相结合的蔓延测度方法,利用杭州市1978~2010年的遥感影像,实证测度中国大城市蔓延的时空动态变化。测度结果表明,城市土地扩张与人口密度指标相结合的方法测度效果良好,与实际情况吻合度高。杭州城市蔓延十分典型,主城区蛙跳式开发以及大部分的边缘增长发生在人口低密度区或较低密度区,城市发展不紧凑,蔓延迅速;阶段特性显著,在空间上表现为由单一中心向多核心发展的态势。将城市土地扩张与人口密度指标结合来测度城市蔓延是十分有益的尝试,为中国大城市蔓延的测度研究提供了一种简单、易于推广使用的可选方法。
Based on the core features of discontinuous land use and low population density, this paper proposes a measure to measure the spread of urban land expansions combined with population density indicators. Using the remote sensing images from 1978 to 2010 in Hangzhou, The dynamic changes of space and time in the spread of big cities. The measurement results show that the method of combining the urban land expansion and population density indicators has a good effect and is highly consistent with the actual situation. The urban sprawl in Hangzhou is very typical. The frog jumping development in the main urban area and most of its marginal growth occur in low-density or low-density areas. The urban development is not compact and spread rapidly. The characteristics of the phases are significant and spatially represented by a single center Multi-core development trend. Combining urban land expansion and population density indicators to measure urban sprawl is a very useful attempt, providing an easy and easy-to-use alternative to measure the spread of mega-cities in China.